Power-transmission device.



C. W. WEISS. POWER TRANSMISSION DEVICE. APPLICATION FILED MAY I4. I913-1,14 ,9 2, Patented July 20, 1915. 9 SHEETS-SHEET I- I In I.

nun H IQIM wm w/274 c. w. WEISS. I POWER TRANSMISSION DEVICE;APPLICATION FILED MAY |4| I913.

9 SHEETS-SHEET 2- IHVEHIOI: by @Al Patented July 20, 1915.

C. W. WEISS.

' POWER TRANSMISSION DEVICE. APPLICATIDN FILED MAYH, I913.

Patented July 20, 1915 9 SHEETS-SHEET 3.

c. w. wuss. POWER TRANSMISSION DEVICE. APPLICATION FILED MAY 14. 1913-Patented July 20, 1915.

9 SHEETS-SHEET 4- C. W. WEISS. POWER TRANSMISSION DEVICE.

9 SHEETS-SHEET 5- Patented July 20, 1915.

APPLICATION FILED MAY I4, ISIS- C. W. WEISS. POWER TRANSMISSION DEVICE-APPLICATION FILED MAY 14. 1913.

Patented July 20, 1915. 9 SHEETS-SHEET 6.

r 2 nu filial yemor:

C. W. WEISS.

POWER TRANSMISSION DEVICE. APPLICATION FILED MAY 14, 1913'.

1,146,982. Patented July 20, 1915.

9 SHEETS-SHEET 7.

Inventor: I I Q 1 I Atria Patented July 20, 1915. 9 SHEETS-SHEET 8.

C. W. WEISS.

POWER TRANSMISSION DEVICE. APPLICATION FILED MAY 14. 1913.

C. W. WEISS. POWER TRANSMISSION DEVICE. APPLICATION FILED MAYI'I. 1913.

1,146,982" Patented July 20, 1915.

9 SHEETS-SHEET 9.

o/vs HE VOLU 7' ION ONE REVOL 077 N.

Altest: 5 gm own or not. The speed. of the forward cam.- w. wnrss, ornew roan, n. Y.

IE'OWERTBANSMXSSION DEVICE.

1l,1st6,982.

Specification of Letters Patent. padjtififljtfidldlfllllly 219,1915.

Application filed May 14, 1913. seriainro. 767,604. i

To all whom it may concern!.

Be it known that I, CARL W. Weiss, a'citi zen of the United States,residing in the borough of Brooklyn of the city of New York, in thecounty of Kings, in the State of New York, have invented certain new anduseful Improvements in Power-Transmission Devices, of which thefollowing is a specification, reference being had to the accordpanyingdrawings, which form a part hereof.

This invention relates to devices for transmitting power, at a variablespeed, from one moving part to another.

The object of the invention is to produce such a device which shall becomplete in itself, simple and compact in structure, not subject to slipor excessive wear yet not employing toothed gears or dependent uponfrictional drive, showing no material loss in eiiiciency, and capable oftransmitting power at any speed from zero to the maximum permitted bythe construction. By these characteristics the improved device isdistinguished from previous forms of transmlssion devices,whethergearedor frictional or hydraulic. I

Described generally the new transmission device comprises a rotatablemutoror power transmitting body through the functioning of which thespeed variation is accomplished,

a coiiperating body concentric with the mu-' tor, one ofthese partshaving a spherical bearing surface and the other having grippingelements to cooperate with the spherical bearing surface, meansto varythe relative angular axial position of such bodies, means to rotate oneof such bodies and means to transmit rotation from the other of suchbodies. hereinafter the power is transmitted from the driver to thedriven part through a nutating body or mutor, which, receiving itsmovement of nutation from the driver, acquires, through such movement ofnutation, a continuous forward movement of r0.- tation about its ownaxis, which it transmits to the driven part, or imparts a continuousforward movement of rotation to the driven part through its movement ofnutation,

whether it has a movement of rotation of its movement of rotation ofthenutating body, relative to the movement of rotation of the driver or thespeed of'rotation ofthe driven part,'relative to the movement ofrotation of In the forms of the ,device described.

the driver, is dependent upon the angular displacement of the axis ofrotation of the nutating body with respect to the axis of nutation,being zero when that angular displacement is zero and increasing as theangle of displacement increases. By varying the angular displacement ofthe nutating body it is therefore possible to vary the speed ratiobetween the driver and the driven part from zero to the maximum, themaximum being determined by the maximum angular displacement of thenutating body which is the practicable limit of displacement'imposed bystructural considerations. In order that the nutating body or mutor mayacquire-a movement of rotation about its own axis through its nutatingmovement or that the driven part may acquire a movement of rotationthrough the nutation \Of the nut-ating body, it is necessary that anonnutating body, whether stationary or rotatable about its own axis,shall cooperate with the nutating body. lit will be evident that theconstruction and arrangement of the nutating body, of its coiiperatingpart, of the means by which the mutating movement is imparted to thenutating body from the driver and of the means by which the rotarymovement of the nutating body about its .own axis is communicated to thedriven part ,or by which the driven part acquires a move ment ofrotation from the nutation of the nutatin-g body, may be varied to suitdifierent applications of the improved power transmitting device andvarious requirements and conditions of use and in the accompanyingdrawings are illustrated several difierent embodiments of the invention.

In the drawings Figure 1' is a view, partly in longitudinal centralsection and partly in elevation of one form of the improved transmittingdevice, the nutating body or mutor being shown in the position which itoccupies when its axis of rotation coincides with its axis of nutation.Fig. 2

is a view in sectional elevation, the plane of section being indicatedby the line 2-2 of 1 and the direction of sight being indicated by thearrows thereon. Fig. 3 is a f sectional plan view of some of the parts.

shown in Fig. 1. Fig. 4 is a detail view i'n section of the connectionsbetween the-link and the nutating body. Fig. 5' 'is a view similar toFig. 1, but with the- .nutating body in the position of maximum angular.displacement; Figs. 6 and 'Z are views which 40 a; Pins project from thebarf 0 through longitudinal slots a and'are engaged by a of theinvention, showing balls in place ofthe rollers shown in the prec dingfigures of the drawings and showing also provisions for permitting suchyielding as willprevent breakage in case of emergencies. Fig.

10 is a view illustrating a further embodiment of the inventionshowingparticularly means for-controlling the yielding of the parts soas to prevent .breakage in case of emergency and for preventing at willthe transmission of power through the device 1 regardless of the angulardisplacement ofv the nutating body. Fig. 11 is a detail view showing afurther modification of the construction shown in Fig. 10. Figs. 12- and13 are views illustrating still another embodiment of the. inventionwhich differs from .the other forms shownespecially in the devices forsecuring the necessary coaction between the nutating body and its cosoperating part. Fig. 14 is a. diagrammatic and graphical illustration oftwo paths taken by' the mutor during one revolution of the driving shaftat each of two'dilferent ,or mutor a' is secured axially a stud i whichangles of .nutation. I I In the embodiment of the invention illus- Itrated in F igs.' l-5 the driving pm or shaft ais shown as mounted forrotation in suit-1 .able bearings on astandard 6, having an enlargedhead a and a collar, 0 byawhich longitudinal movement of theshaft ispre: vented. The shaft a is bored axially from .the head end to receivea longitudinally movable bar 0 which rotateswith the shaft groovedcollar d." The latter is encircled by 'a'loose collare which is engagedby a' forked lever f, pivoted on .the base 6. The lever is provided witha spring detent f for engagement with a fixed rack f Byfithese meansrovision is made for the longitfudi- ,nal shi ting of the bar 0" whetherthe shaft (1 is, rotating or not.. In the. end of the bar 0 buteccentrieally with respect thereto, is pivoted aflink 'gi'which 'formsthe meansby which themovementxof 'nutation is im- "parted to themutating body or-mutor from I the driver andby which the angulardisplacement of the nutating body or mutor is I effected, ashereinafterdescribed. The; head aof the shaft a is slotted as at a to receive thelink..

'III-aJLOf he embodiments cum; invention .illustrated n the drawings thenon-nutating part which cooperates withxtheahutating body ;ormutorisshownas nan internally spherical stationary bearing andsuch anembodiment of. the-cqoperati g Part is preferable for most applicationsof the improved power transmission device, but in the embodii ment ofthe invention shown in Figs. 6 and 7 and in Figs. 8 and 9 there is alsoshown a nonnutating part for coiiperation wlth the nutating body ormutor which is internal with'respect to the nutating body .and is itselfrotatable, as hereinafter described, and it will therefore be understoodthat the cooperating part is not necessarily external to the nutatingbody or mutor nor stationary.

' In the form shown in Figs. 1-5 the cooperating part i is shown as twohemis- I pherical shells 12. and k which are secured together while oneof them, as 71. is secured to the bearing of the. head a of the shaft awhich is supported within the cooperating 7 body orbearmg hand 'isadapted to have therein a movement of nutation and a movement ofrotation about its own-axis- The movement of hutation is imparted \to itfrom the driving shaft a through the medium of the link 9.. To thenutating body isembraced by av two-part sleeve 6 the stud piceoftheforked Iink g. The details of this construction are shown clearly inFigs.

3 and 4.

There are'mountedon the nutatingbody of mutor z rollers which aresup-ported by roller bearings k on shafts if. The latter are supported.on rollers k shown in dotted" linesin Fig. 2, which are mounted in acircumferential groove in the web i of the nutating body or mutor, onshort shafts la which are parallel withthe axis of rotation of thenutating-body or-muton The rollers la'aredisposed in radial slots i inthe flange or web of the nutatingrbedy or mutor and are narrower thanthe slots respectively. Each roller k therefore is free for limitedmovement in either direction ona tangent ,or chordof-the'arc of a.circlethe center of which coincides with the axis of rotation I of thenutating body. or mutor; It will be evident that movement of the rollerto one side or the other of the slot it, from a mid dlepositiomhicreases slightly the radial dis tance of the surface'of theroller which is next'the bearing k from the axis of rotation of thenutatinglbody' or mutor and from the 'center of the spherical bearing,through which center the. axis of rotation of the nutatin'g "bodyor.-mutor and che axis of nutation thereof pass and in which they 1intersect. v

.The nutating body. or mutor is so supported within the hearing as tohave a free nutating movement and a free movement of rotation in thedirection 'of'rotation of the driver a. and to have, against thebearing, points of contact which, though constantly changing with thenutating movement and with thearotating movement, are points ofresistance against which the force, or one component of the force, whichis transmitted from the driver, reacts. For this purpose there aremounted on the nutating body or mutor z, rollers k which are supportedby roller bearings k on shafts k The latter, are supported on rollers.70 shown in dotted lines in Fig. 2, which are mounted in acircumferential groove in the web i of the nutating body 'or mutor, onshort shafts 7a which are parallel with the axis of rotation of thenutating body or mutor. The rollers 70 are disposed in radial slots 2'in the flange or web of the nutating body or mutor and are narrower thanthe slots respectively. Each roller 70 therefore is free for limitedmovement in either direction on a tangent or chord of the arc of acircle thecenter of which coincides with the axis of rotation of thenutating body or mutor. It will be evident that movement of the rollerto one side or the other of the slot i from a middle position, increasesslightly the radial distance of the surface of the roller which is nextthe bearing it from the? axis of rotation of the nutating body or mutorand from the center of the spherical bearing, through which center theaxis of rotation of the nutating body or mutor and the axisof nutationthereof pass and in which they intersect. Each roller bears normallyagainst the spherical bearing and rotates freely on its own axis, as itmust to permit the free nutating movement of the mutor, and movementofthe roller to one side or the other of the slot i causes the surface ofthe roller to press tightly against the spherical bearing surface, andtherefore to furnish a point of reactance, which the nutating body ormutor must' have on the coiiperating body or spherical bearing in orderthat the mutor may acquire a forward rotary movement with its nutatingmovement. driven shaft is sufficient to cause such shift-g ingof therollers in their slots, so as to cre- 7 ate the necessary pressurebetween the roll- The resistance of the operating bodyor sphericalbearing. The Y actance of the rollers against the spherical earingduring-the nutating movement of the mutor causes the forward rotation ofthe nutating body or mutor on its own axis in the direction ofrotation'of the driver, and the extent of such forward rotation at eachnutation is dependent upon-the angle of the '-'nutating movement.

It will be seen that when the axis of rotation of the. nutating body orinutor coincides with the axis of nutation, which is also the axis (ifrotation of the driver a, the sleeved? which is carried in the end ofthe link 9 will rotate freely about the stud i and that there will thenbe no nutating movement of the mutor i, which is stationary. In, thisposition the mutor 2' cannot be rotated in either direction, since theshifting of the mutor in either direction with respect to the rollerscauses them to bear against the cooperating body or spherical bearing soas to prevent further movement. It will also be seen that if the bar 0be moved longitudinally toward the left in Fig. l'it will, since the;link 9 is pivoted 'eccentrioally in the end of the bar 0, change theangular position of the nutating body or mutor toward the position shownin Flg. 5.

A stop pin a in the head a of the shaft a prevents movement of the linkin the opposite direction from its position of rest. As the angle of theaxis of rotation of the nutatingbody' or mutor increases with respect tothe axis of nutation, the speed ratiov between the rotation of thedriver and the rotation of the nutating body or mutor on its own axiswill decrease from infinity toward one, and when an angular displacementof forty-five degrees has been reached the ratio will be about ten tothree.

It remains now to describe the means by which the movement of rotationof the nu-.

tating body or, mutor is imparted to the driven'part or shaft m.. In theconstruction shown in Figs. 15 this result is accomplished by a directconnection which nevertheless has such flexibility as to permit thenutating movement of the mutor to take place freely. As shown, the shaftm is mounted in a bearing formed with the part 71, of the casing and isheld from longitudinal movement therein by an integral collar m insideof the bearing and a removable collar m outside of the bearing. On a pinm which passes transversely through the inner end of the shaft m arepivoted two purpose where the 'power to'betransmitted is not too greator where the construction issuch as to permit heavy linkageto beemployedand where a minimumspeed ratio of about ten to three between'thedriverand the driven part is satisfactory. Other forms of transmitting meansbetween the mutor and the driven part may be preferred, however, Whenconsiderable power is to be transmitted and when a smaller minimum speedratio is desired and such other forms -will be describedhereinafter'with reference to other figures of the drawings in whichthey are illustrated.

In the new transmission gear, the mutor is driven-by a link whichconnects the driving shaft to what may be called the crank pin of themutor, the spherical shell or body being fixed. Assuming that the pointof connection of the link to such crank pin'of the mutor lies ina sphereof the-'sameradius as the spherical shell, it will be seen that themathematical or imaginary crank arm by which the mutor is nutated varieswith the angle between the axis ofthe mutor and the axis of thedriving-shaft. When the mutor is in the position shown in Fig. 1 of thedrawings and the angle'betweenthe axis of the mutor and the axisof thedriving shaft is zero, such mathematical or imaginary crank arm is zero.As'the angle is increased, as shown, for example, in Fig. 5, themathematical or imaginary crank arm is increased. If the angle wereincreased to 90 (whichispractically impossible) the mathematical orimaginary crank arm would then be the same as "the radius of thespherical shell. When the angle between the axis of the mutor and theaxis of the driving shaft is zero and the mathematical-- crank arm iszero the driving shaft rotates freely at full-speed and the-driven shaftis stationary. The ratio'of the speed of the driving shaft to -the speedofthe driven shaft is therefore infinity. If the angle be.- tween theaxis of the mutor and the axis of' the driving shaft could beincreasedto (which is possible theoretically butnot practically) and themathematical crank arm could become the same as the radius of thespherical shell, or unity, then the speed of the driven *shaft would bethe same as the speed of the driving shaft and'the ratio of the speed ofthe-driving shaft to the speed of the driven shaft' would'be as 1 to 1,or unity. The ratio of the speed of the driving shaft to the speed ofthe driven shaft therefore decreases from infinity to unity with theincrease of the angle between the axis of the mutor and the-axis of thedriving shaft, but not in the same ratio. It is found that the speedratio decreases inversely as the versed sine of the angle between theaxis of the 'mutor and-the axis of the axis of the mutor and the axis ofthe driving shaft, each point of contact between the mutor and thespherical shell follows a certain path. The track of each gripping.

roller in'the inner surface of the spherical shell is a zig-zag, theamplitude of which increases with the increase of the angle between theaxis of' the mutor and the axis of the driving shaft. In Fig. 13 isshown diagrammatically and graphically two such paths as far as they areformed by one rotation of the driving shaft'at each of two differentangles of nutation, that'is, at each of two different angles between theaxis of the mutor and the axis of the driving shaft.

The pathformed for the larger angle is indicated by the heavy line oflarge amplitude. The path formed for the smaller an"- gle is indicatedby the heavy part of the line of smaller amplitude for one rotation ofthe driving shaft, the same beingcontinued by a lighter line for twomore rotations of the driving shaft. While the particular point ofcontact under consideration between the mutor and the spherical shelldescribes the path indicated for one rotation of the driving shaft atthe greater angle, its position in a circumferential line about the axisof the driving shaft advances from one extreme of the figure to theother and the'distance through which it thus advances represents aportion of a rotation of the driven shaft. In the same manner while thepoint of contact for the smaller angle describes the path shown for onerotation of the driving shaft, it advances in the same direction througha distance which represents'a portion of a rotation of the driven shaftproduced by one rotation of the driving shaft. Now it will be seen thatthe distance advanced for the larger angle is greater than the distanceadvanced for the smaller angle, the distance advanced for the greaterangle being, in the example shown, three times the distance advanced forthe smaller a'ngle.

Itisof course understood that the gripping bodies carried by the mutorin the construction shown in Fig. 1. of the drawings are not necessarilyrollers but, for the purposes of this explanation, they may be regardedas rollers and the path formed by one of such'rollers as indicated inFig. 13 may readily be conceived and it will be seen that as one of therollers rolls on the zigzag athit also advances from one side of thegure to the other, carrying with it the "s een that the arrangement ofthe nutating body or mutor, the driver, the means for imparting to themutor its nutating movement and the means for varying the angularposition of the nutating body or mutor are the same as described withreference 'to Figs. 1-5. The construction of thecooperating body orspherical beaijng isalso' substantially the same as that described,except that the internally spherical bearing is formed wholly in.onepiece 71. for convenience in manufacture, and is secured between twoparts 71. and k which complete the shell or casing. The nutating body ormutor i is provided with rollers k as before. In place of the directconnection between the nutatin g body or mutor and the driven part,how'- ever, there is substituted a means for transmitting the rotarymovement of the mutor ,to the driven part which permits the speed ratioto be further reduced to'aboutten to six. This means of imparting rotarymove ment is itself dependent upon the nutating movement of the mutorand embodies the same principle of operation as that which results inthe continuous forward'rotary movement of the mutor or nutating body onits own axis. This embodiment of the inven- F 'tion'also illustrates apossible different arrangement and relation of the nutating body and itscooperating part. In this form the nutating body or mutor i is itselfformed withan internal spherical bearing surface i for cooperation withrollers m which are mounted, in the same manner as the rollers 70, in acarrierm which is fixed on the driven shaft m. The rollers m bearagainst the spherical bearing "a" during the nutations of the inutor 2'in the same manner that the rollers lv'bear against the sphericalbearing h. A relative lateral movement of each roller on the carrier,whethercaused by a relative rotary mov'ementofthe carrier with respectto the mutor or of the mutor with respect to the carrier, causes ittopress tightly agaiiist and grip the spherical bearing surface. If

the nutating bodyor mutor be regarded as, a nutating body only, withoutrotary move ment about'its own axis, it will be seen that the-component,in a circumferential' direction, of the movement of any point on aninternal spherical bearing surface 5' of'the' nutating body ormutor,withiwhich a roller m is in contact,. causes'such roller to have;

a movement in thesame circumferential direction. Consequently thenutating movement alone of the nutatin body or mutor imparts toits-cooperating 'ody or bearing a continuousforward rotary movement,even if the nutating body itself has no continuous forward rotarymovement; It will be understood, ,therefore, that the invention may berealized in a structure in which the cooperating part has a movement ofrotation and the nutating part has no motion of rotation about its ownaxis. It will also be seen that as the nutating part, in theconstruction shown, has a movement of rotation about its own axis aswell as a movement of nutation and that suchrotary movement will beimparted to the cooperating body by the gripping action between therollers and the nutating body or mutor, the movement imparted to thedriven part, such as the shaft m, is a resultant of the rotatingmovement and the nutating movement. If it were a resultant of therotating movement alone the speed of rotation of the driven part wouldbe the same as the speed of rotation of the nutating body about its ownaxis, as is the case in the construction shown in Figs. 1-5. Thecomponent of the rotary movement of the driven part which is due to thenutating movement of the mutor is in addition to the component due tothe rotary movement of the mutor about its own axis, so that the speedof rotation of the driven part is greater than the speed'of rotation ofthe mutor about its ownaxis. In the con-- struction shown in Figs. 1-5,in which the:

driven part has thesame speed of rotation as the mutor, the maximumspeed ratio between thedriving shaft and the driven shaft is about tento three, whereas in the cons'truction shown in Figs. 6; and 7, for thereasonsv just explained, the maximum speed ratio of the driving shaft tothe driven shaft is about ten to six.

Referring now to the embodiment of the invention shown in Figs. 8 and 9it will be oted therein the link 9 which constitutes the means forimparting to the :nutating body or .mutor its nutating and rotatingmovements and also constitutes, through the longitudinal movement oftheshaft a, the means for varying the angular displacement of the nutatingbody. The link 9 is connected with the nutating body or mutor 71substantially in the same manner as alreadydescribed, carrying a sleeve6 which embraces the stud z" of the mutor, the sleeve 2' being somewhatshorter than the stud so that it may have a limited longitudinalmovement thereon. The link is pivoted in the shaft in the plane of theaxis and has a too 9 which bears against the mutor at one side of itsaxis, so that when the longitudinal movement of the shaft a commences,

from the zero position, the pressure is exerted against the mutor at oneside of its axis and therefore starts the mutor from its centralposition, the sleeve 2' sliding on the stud 2" until the mutor has movedsufiiciently from its axial or zero position to permit the continuedthrust of the link to be exerted upon it through the stud i. Thepivoting. of the link in the axial plane of the shaft prevents anunbalancing of the load when the driving shaft is rotating and the mutoris in its axial or zero position, and the unbalancing of the load inother positions is prevented by providing the link with a counterbalanceg in rear of its pivot, which substantially balances the link when thelink is in any other than the axial or zero position.

The cooperating part or spherical bearing F, as shown in Figs. 6 and 7,is formed wholly in one piece which is secured between the two parts [tand k which complete the shell or easing. In order to provide for slipbetween the driver and the driven part of the transmission device inemergencies, as in the case of a sudden change from high to low speed,the spherical bearing or cooperating body 72. is held yieldingly betweenthe parts 72. and k of the shell, which are separated slightly and areheld together yieldingly by means of bolts 71., between the heads andnuts of which and the corresponding abutments on the parts 72, and k ofthe shell are placed springs 72.. By setting up the bolts 72. more orless the pressure with which the bearing piece If is held between theparts 71. and k may be "aried and the degree of force required to rotatethe bearing piece is regulated. In the ordinary operation of thetransmission device the bearing piece 72 is stationary and the mutorreacts against it through the clutching action of the revolublebearings, but ifthe stress induced by a sudden change of s eed is sogreat as to render liable the brea age of parts, the bearing piece willyield, .rotating with the mutor, and so prevent breakage. L v

In the various forms of the transmission device shown in Figs. 1'-7 therevoluble bearing bodies between the mutor and the cooperating body orspherical hearing are shown asjrollers. -In .some cases, especially if'the crushing strains are excessive, spher .ical bearing bodies or balls.may be. substituted for the rollers.

As shown in Figs. 8,and' 9 the outer surface -.of the nutating body ormutor 2' is formed with a' peripheral series offlats ortangential'bearing. surfaces i upon which rest balls which may be'heldplace on the surface of the mutor by ball retainers 74 These balls actin the same manner as do the rollers already described, permitting thefree nutating movements of the mutor and acting as gripping rollersbetween the mutor and'the cooperating body or spherical bearing toprovide the points of reactance necessary for the production of therotary movement. Similarly balls may replace the rollers shown in Figs.6 and 7 which constitute the means by which the rotary movement of themutor is imparted to the driven shaft. The driven shaft m has aspherical head or bearing surface m" which is formed with flats ortangential bearing surfaces m On these flats or tangential bearingsurfaces bear ballsm which may be held in place by retainers m and coaetwith the internally spherical surface 2' of the nutating body or mutor2'.

- The embodiment of the invention shown in Fig. 10 is substantially thesame as that shown in Figs. 6 and 7 with respect to the relation of thenutating body to the cooperating part and to the driven shaft and'thesame as that shown in Figs. '8 and 9 with respect to the means forimparting to the mutor its nutating movement and for varying its angulardisplacement. In the construction shown in Figs. 8 and 9 provision ismade for permitting the yielding of the cooperating part for the urposeof preventing bi'eakage in case 0 sudden stresses. In some applicationsof the invention it may be desirable to provide for decoupling betweenthe driver and the driven part, that is, for permitting the driven partto be brought to rest at will regardless of the rotation of the driverand the angular displacement of the nutating body or mutor. Provision ismade for this in the construction shown in Fig. 10, in which thecooperatingpart or spherical-bearing k is shown as formedin one pieceheld releasably in the outer shell or casing which consists of the endmembers it and h and the cylin drical body member It. At each end of thecooperating body or spherical bearing placed an annular friction plate.k It". 'An annular movable head h is pressed against the friction plate72 so as to clamp the cooperatingpa'rt 72. between the? friction platesand hold it normally from rotation, by spring plungers h which arecarried by the end plate It. The hub it of the'movable head it isextended outward beyond the hub of the end plate It and is formed with acoarse screw thread, to receive a. lever nut It"; By rotation of thelever-nut h" in the proper direction-the-movable head it may.

be withdrawn against the pressure of the springplungers it" so as torelease the cooperatingpart or frictional bearing 72. and permitxit ,to.ti11' n withthenutating body.

described lends itself to a direct drive from the driving shaft a to thedriven The nutating body or mutor then has. no points of reactanceagainst a stationary part and consequently has no forward rotation onits own axis. Furthermore, as it has no points of reactance, it is freeto be rotated backward by the cooperating action of its internalspherical bearing surface 77 and is therefore incapable of producing anyrotation of the driven part against resistance. Consequently, when thecooperating part 71. is free to turn no movement of rotation will beimparted to the driven part m whatever may be the speed of rotation ofthe driver or the angular displacement of the mutor.

The structure shown in Fig. 10 and just shaft, if such a direct drive"be desirable. A device adapted for this purpose is shown in Fig. 11 inwhich the friction plate 72 is shown as secured by screws it to thecooperating part or spherical bearing hf. Keyed on the driven shaft m isa friction plate on and mounted loosely on the hub of the frictionplatem is another friction plate m, the friction plate 71, being locatedbetween the friction plates m and'm. The hub of the friction plate m isformed with an annular cam shoulders at and the rim of the nutating body2' is formed, as at i so as to coact with the annular cam shoulder 'm.andthe friction plate m", so that when the nutating body" is thrown toits extreme position, as shown in Fig. 11, it will press the frictionplate at firmlytoward the friction plate m and clamp, the friction plate71 firmly between them, thereby directly connecting the sphericalbearing or cooperating body 7:. with the driven shaft m. It beingassumed that the cooperating body or spherical bearing is released bythe drawing back of the clamping head 71, when the nutating body isthrown into the extreme position shown in Fig. 11, so that thecooperating body or spherical bearing 71. is then free to rotate, itwill be seen that as the cooperating body or spherical bearing is thenrotated, through the nutatingbody, at the same speed as the drivingshaft, and as the driven shaft s connected to the coiiperating part orspherical bearing so as to rotate therewith, the driven shaft must alsobe rotated at the same speed as the driving shaft.

The change of radial distance between the outermost point of theperiphery of each ball or roller carried by the nutating body,

which is necessary to effect the gripping action between the nutatingbody and the coofierating part or spherical hearing, may be e ected bymeans other '-.than the lateral shifting of the roller on the tangent orchord of the nutating body, or on such a tangent or chord: Oneform ofsuch other means isshown in Figs. 12 and 13. In the constructionshown inthese two Ting a rotatable mutor, a coiiperatin the rolling of a ballfigures of the drawings the driving shaft 0, 2

the link 9, the nutating body 2' and the cooperating part or body orspherical bearing k are, arranged as shown in Fig. 12. The nutating body1? is also provided with rollers is, substantially as described, but therollers have no lateral movement on or with respect to the nutatingbody. The latter is formed with cuts 71 which extend from its rim nearlyto its base or hub, so that each roller 76 is supported by a relativelyyielding portion of the nutating body. Within the nutating body is acarrier 71, which nutates with the nutating body but may have a limited,relative rotary movement. It is shown as having at its pole a stud nwhich enters an axial recess in the hub or head of the nutating body asa centering device and guide. The

carrier 12. has formed in its outer surface,

near its rim, a ball race, 72. and the nutating body has formed in itsinner surface, near its rim, a corresponding ball race i. These ballraces, or both of them, at any rate, are not truly circular, but aremade up, or at least one of them, of a series of shallow taperedpockets, as shown in Fig. 13, in each one of which is placed a ball a Itwill now be seen that any relative rotation of the carrier and thenutating body will cause the nutating body to expand and to press itsrollers 70 firmly against the cooperating body or spherical bearing itso that the rollers shall ,have the points of reactance against thespherical bearing which are necessary to secure the desired forwardrotation of the nutating body on its own axis. The relative rotarymovement of the nutating body and carrier necessary to efi'ect theexpansion of the nutating body is secured through the resistance of thedriven shaft m, to which-the carrier may be directly connected through alinkage such as that already described with respect to the constructionshown in Fig. 1.

Various other structures will suggest themselves as possible embodimentsof the invention to suit difi'erent conditions of use and it will beunderstood that the invention is not limited to any of the forms shownand described herein but is capable of realization in structures whichmay difier. widely in appearance and in non-essential details,

I claim as my invention 1. A power transmission device com ris- 'o'dyconcentric withthe mutor, one of sai parts having a sphencal bearingsurface and the other of said parts having gripping elements tocooperate with the spherical bearing surface, means to vary the relativeangular axia position of said parts, and driving means for one of saidparts. r

2. A power transmission dev1ce comprising a rotatable mutor, acooperating concentric with the mutor, one of said parts ing a mutor,means to impart to the motor a movement of nutation and a consequentmovement of rotation on-its own ax1s, and means to impart the movementof rotation of the mutor on its own axis-to the driven art. a p 4:. Apower transmission device comprising a nutating body, a cooperatingbody, one of said bodies having a spherical bearing surface and grippingelements carried by the other of said bodies and cooperating with saidspherical bearing surface, whereby one of said bodies acquires, throughthe nutation of thenutating body, a movement of rotation on its ownaxis.

5. A power transmission device comprising a nutating body, a sphericalbody for cooperation With the nutating body and driving means betweensaid two first named bodies whereby one. of said first named bodiesacquires, through the nutation of the nutating body a movement ofrotation on its own axis.

6. A power transmission device comprising a nutating body, a cooperatingbody, one of said bodies having a spherical bearing surface, and rollinggripping elements carried by the other of said bodies and copperatingwith said spherical bearing surace.

7. A power transmission device comprising a mutor, a body forcooperation with the mutor and concentric therewith, the mutor andthe'cooperating body having the one acspherical bearing surface and the.other grippingelements for 'coaction, and means to impart movement ofnutation to the mutor whereby one of said two first named parts acquiresthrough the nutation of the nutating body a movement of rotation uponits own axis.

8. A power-transmission device comprising a mutor, a body forcooperation with the mutor and concentric therewith, the mutor and thecooperating body having the one a spherical bearing surface and theother rolling gripping elements for coaction with said spherical bearingsurface, and means I one a spherical bearing surface an to impartthemovement of rotation of the mutor on its own axis to the driven part.

9. A power transmission device comprising a mutor, a body forcooperation with the mutor and. concentric therewith, the mutory and thecooperating body havin tllie t e other gripping elements for coactionwith tor a movement of nutation,

said spherical bearing surface, means to impart a movement of nutationto the mutor, and means to vary the angle of nutation of the mutor.

10. A power transmission device comprising a driver, a driven partaxially in line with the driver, a mutor, means to impart a movement ofnutation to the mutor, and means whereby the driven part acquires amovement of rotation through the nutat ing movement of the mutor.

11. A power transmission device comprising a driver, adriven part, amutor, means to impart from the driver to the mutor a movement ofnutation, a body cooperating with the mutor whereby the mutor acquires amovement of rotation on its own axis, and means to impart the movementof rotation of the mutor to the driven part. J

12. A power transmission device comprising a driver, a driven partaxially in line with the driver, a mutor, means to impart movement ofnutation to the mutor, means to vary the angle of nutation of the mutor,and means whereby the driven part acquires a movement of rotationthrough the nutating movement ofthe mutor. 13. A power transmissiondevice comrisin a driver a driven art a mutor means to impart from thedriver to the mumeans to vary the angle of nutation of the mutor, a bodycooperating with the mutor whereby the mutor acquires a movementofrotation on its own axis, and means to impart the movement of rotationof the mutor to the driven part. 14:. A power transmission devicecomprising a driver, a driven part, a mutor, means to impart to themutor from the nally spherical bearing for cooperation with the mutorwhereby the mutor acquires through its nutating movement a movement ofrotation on its own axis, and means to impartthe' movement of rotationof the mutor to the driven part.

15. A power transmission ing a drlver, a driven part, a mutor, means toimpart to the mutor from the driver a movement of nutation meansto varythe angle of nutation of the mutor, an internally spherical bearing forcooperation with the 'mutor whereby the mutor acquires through itsnutating movement a movement of rotation on its own axis, and means toimpart the movement of rotation of the m1- tor to the driven part. 16. Apower transmission device comprising a driver, a driven part, a-mutor, ameans to impart to device compristhe mutor from the driver a. -movementof nutation, rolling gri driver a movement of nutation, an 'inter- Qgripping bodies of the mutor whereby the mutor acquires through itsnutating movement a movement of rotation on its own axis, and means toimpart the movement of rotation of the mutor to the driven part.

17. A power transmission device compris a driven part, a mutor, a linkconnection between the driving'shaft and the mutor, an

with the mutor whereby the mutor acquires through its nutating movementa movement of rotation on its own axis, and means to impart the movementof rotation ofthe mutor to the driven part. I v

18. A power transmission device comprising a driver, a driven part, amutor, means to impart to the mutor from the driver a movement oinutation, an internally spheriwhereby the mutor acquires through itsnutating movement a movement of'rotation on its own axis, and a linkconnection between the mutor and the driven part whereby the movement'ofrotation of the mutor is imparted to the driven part.

19. A power transmission device comprising a driver, a driven part, amutor, means to impart to the mutor from the driver a movement ofnutation, an internally spherical bearing for cooperation with the mutorwhereby the mutor acquires through its nutating movement a movement ofrotation on 1 its own axis, means to impart the movement of rotation ofthe mutor to'the' driven part,

and means to hold the spherical bearing yieldingly from rotation.

20. A power transmi 'on device comprising a driver, a driven part, amutor, means to impart to the mutor from the driver a movement ofnutation, an internally spherical bearing for cooperation with the mutorwhereby the mutor acquires through itsnutating movement a movement ofrotation on its own axis, means to impart the movement of rotation ofthe mutor to the driven part, means to hold the spherical bearingyieldingly from rotation, and means to vary the angle of nutation of themutor.

21. A ower transmission device comprising a driver, a driven part, amutor, means to impart to the mutor from the driver a ing alongitudinally movable driving shaft,

internally spherical bearing tor cooperationcal bearing for cooperationwith the mutor movement of nutation, an internally spherical ,bearingfor cooperation with the mutor whereby the mutor acquires through itsnutating movement a movement of rotation on its own axis, means toimpart the movement of rotation of the mutor to the driven part, meansto hold the spherical bearing yieldingly from rotation, means to varythe angle of nutation ofthe mutor, and means whereby the internallyspherical bearing is released through variation of the angle of nutationof the mutor.

22. A power transmission device comprising a, driver, a driven part, amutor means to impart to the mutor from the driver a movement ofnutation, an internally spherical bearing for cooperation with themutor, and means to connect operatively the spherical bearing and-thedriven part.

23. A power transmission-device comprismg to impart to the-mutorfrom thedriver a movement of nutation, an internally spherical bearing forcooperation with the mutor whereby the mutor acquires through its nuadriver, a driven part, a mutor, means tating movement a movement ofrotation on cal bearing for cooperation with the mutor whereby the mutoracquires through its nutating movement a movement of rotation on its ownaxis, means to impart the movement ofrotation of the mutor to thedrivenpart, meansto hold the spherical bearing yield- 7 ingly fromrotation, means to connect operatively the spherical bearing with thedriven part, and means to vary the angle of nutation of the mutor.

This specification signed and witnessed this tenthday of May A D., 1913.

CARL W; WEISS. Signed in the presence of- V W. B; G,

Won'rmo'mN CAMPBELL.

